Water and Effluent Treatment Magazine
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MaY 2015 WET NEWS 19 PUMP HIRE, SALES & SERVICE PUMP HIRE, SALES PUMP HIRE, SALES & SERVICE 08450 733835 www.selwoodpumps.co.uk UK's No1 Pump Hire Specialist Pumps From 50mm To 300mm Auto Self-Priming Pumps Super Silent From 58db(A) Hydraulic Submersibles Electric Submersibles 24/7 Callout Branches Nationwide Selwood has been manufacturing, hiring and selling pumps for over 60 years. Please call for expert advice on all pumping applications. Organised by The 4th annual Integrated Water Resources Management Conference o ers the UK water sector a timely opportunity to consider the next steps in implementing the Water Framework Directive, bringing together the key stakeholders in sustainable water resource management. Join over 100 representatives at this CPD-Certifi ed conference, part of Sustainble Water 2015, to discover: • The latest on strategic implementation of the Water Framework Directive • Examples of 'upstream thinking' and the e ects on water-related ecosystems • How to align company business plans with river basin management plans • Integrated catchment management case studies from diverse stakeholder groups • Industry-leading examples of managing pesticides and di use pollution • Expertise on managing both fl ood and drought resilience • How to apply an Ecosystems Services Approach to catchment management • An evidence-based approach for informing future investment Supported by Prof. Doug Wilson Director of Scientifi c and Evidence Services Environment Agency Chairman UKTAG Yvette de Garis Head of Environmental Regulation Thames Water Jacob Tompkins MD Waterwise Chairman Water Resilience Working Group (Ofwat) Ruth Barden Head of Environment and Catchment Strategy Wessex Water Arlin Rickard CEO The Rivers Trust Chairman CaBA Support Group Andrew Walker Catchment Strategy Manager Yorkshire Water Follow us @WWTlive using #suswater Book online at www.WWT-environment.net SusWater-IWRM-HPH.indd 1 16/04/2015 13:58 MAY 2015 WET NEWS 19 • A steel coffer dam was erected to drain the area of the river bed where the foundations were to be constructed • Sykes Pumps provided 8" submersible pumps to extract water from the river • A further high head hardened steel diesel pump was needed to drive the sand sludge from the hopper to the dam • The technique enabled Jet Pumps to increase the pressure from two/three bar to nine bar • Sand could be pumped into the coffer dam at the rate of 100 tonnes per hour 1 Increased traffic has led to the six-lane toll road crossing being built 2 The Mersey Gateway project is not scheduled for completion until autumn 2017 3 Its 2.3km length includes a 1km span crossing the river, which will be supported by three towers 4 The suspension bridge's cable supports will be attached to the towers "We needed to create a sand sludge to fill the coffer dam and the most efficient way to do that was to use the river as the water source because it was readily available on site and would be pumped back into the river as part of the process. The two 8" submersible pumps were ideal for this purpose due to the rise and fall of the tide. The pressure boost that the UVO 200/150F (D70) provided enabled us to complete that part of the operation within just four days, including night works" Graham Lamond, Jet Pumps UK coffer dam sand filling and the booster pump to drive the slurry pipeline, as well as pipework that was essential for delivering the slurry. Once the coffer dam for the first tower had been filled with sand, an inner ring of steel sec- tions was driven into the ground, creating a robust struc- ture made up of concentric steel circles with sand sandwiched between them. This allowed the central core of sand to be excavated down to the river bed so that the founda- tions for the first tower could be constructed. River solutions The Mersey Gateway project is not scheduled for completion until autumn 2017 and construc- tion of the towers is still under- way. The scheme to create and excavate the first coffer dam is indicative of the way in which the river is both posing chal- lenges to the construction pro- ject and presenting the solutions. An access bridge was constructed between the shoreline and the coffer dam, and submersible pumps were suspended from the temporary structure